BOARD_CONTROL_REG
writel(0, dev->mmio + BOARD_CONTROL_REG);
writel(RX_FIFO_RESET_BIT, dev->mmio + BOARD_CONTROL_REG);
writel(RX_ENABLE_BIT, dev->mmio + BOARD_CONTROL_REG);
writel(BOARD_RESET_BIT, dev->mmio + BOARD_CONTROL_REG);